Having VIVO (video in video out) nvidia cards, 3x times in a row from tnt to geforce to gf3, there's a major con to any AIW type of card. ATI or otherwise.
Time comes you want to upgrade your videocard, to get something faster, for some new game, you lose video capture. So then, you gotta pay extra each and every single time you upgrade the vidcard to either
1) Get another one with video in
2) Snag a separate pci cap card
When I snag geforce fx or whatever, I'm snagging a separate pci cap card. Had it with always having to spend 50 dollars extra or more to replace one vivo card with another. It'd be nice to just be able to drop in some cheap reference nvidia card for gaming and not worry that "oh crap, I gotta get one with video in again".